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(A) UV–vis absorption spectra and photographic images of AuNPs in various systems (curve/tube a, AuNPs; curve/tube b, AuNPs + tripeptide; curve/tube c, AuNPs + tripeptide/DPP-IV). The final concentrations of AuNPs, tripeptide and DPP-IV were 3.6 nM, 5 μM and 250 mU/mL, respectively; (B) dynamic light scattering (DLS) of AuNPs in the absence and presence of tripeptide Arg-Pro-Arg; (C) TEM images of AuNPs in the presence of tripeptide (panel a) and tripeptide/DPP-IV (panel b).
